Do I actually have Stuttering or is it just anxiety?

Do I actually have Stuttering or is it just anxiety? I had a stutter as a child, but at the time it felt normal to me because I did not really understand what stuttering was. I did not even recognize it as a stutter until I was around 23. I went to speech therapy at 28. Now I am confused. When I am relaxed, I speak completely fine and do not stutter at all. But when I am stressed, in an intense discussion, debating with coworkers or friends, or especially when speaking to a superior at work, I stutter a lot and struggle to get words out. Because it mainly shows up under pressure, I keep wondering: is this actually a neurological stutter, or is it just anxiety?